Skema Kertas 1 Biologi MRSM 2009 1 2 3 4 5 6 7 8 9 10
C A C B C D B C B A
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C D B D B A C B A B
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C B D D A C C B D D
31 32 33 34 35 36 37 38 39 40
B A C B D D D D D C/B
Suggested answers to 2009 MRSM SPM Biology Paper 1
Answers prepared by cikgu Sharon. Should you have any suggestions, please leave your comments at my blog: http://www.mybiologypal.blogspot.com We share to help each other. Thanks.
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A B D C C C B D C A
Skema Kertas 3 Biologi MRSM 2009 Q1: a)Highland area: 72, 75, 70, 61, 63. Lowland area:30, 46, 43, 41, 35. b)i) Observation 1: In highland area, the maximum length of pea pod is 75mm//average length of pea pod is 68mm Observation 2: In lowland area, the maximum length of pea pod is 46mm//average length of pea pod is 39mm. ii) Inference 1: Higher altitude/Highland area is more suitable for the growth of pea plant. Inference 2: Lower altitude/Lowland area is less suitable for the growth of pea plant. c) Variables MV: altitude of the area RV: the length of the pea pod FV:*type/variety of pea plant *amount of water
Method Grow the pea plant at 2 different altitude area (highland area & lowland area) Measure & record the length of the pea pods using a ruler. *Plant/grow the same variety/species of pea plants in the 2 areas. *water all the pea plants with the same amount of water everyday.
d) the length of pea pod is longer in highland area compared to lowland area.//the higher the altitude of the area, the longer the length of the pea pod. e)i)
Altitude of the area Highland Lowland
length of the pea pods (mm) 1 2 3 4 5 72 75 70 61 63 30 46 43 41 35
Total length of the pea pods (mm) 341 195
Average length of the pea pods (mm) 68 39
ii) draw bar chart on graph paper provided. *label your y-axis - average length of pea pod (mm) *label your x-axis – Altitude of the area *even scale for both axes * title * draw 2 separate bars on the graph paper f) When the altitude of the area is higher (at highland area), the average length of the pea pod is longer (68mm) because highland area is more suitable for the growth of pea plant. g) variation is the differences in characteristic (longer or shorter in terms of the length of the pea
pod) among the individuals of the pea plant & the length of the pea pod is affected by environment factor which is the altitude of the area. h) the average length of the pea pod will be less than/shorter than 39mm because in the dark room, without light energy; pea plant cannot carry out photosynthesis to produce food/glucose. Glucose is needed for cellular respiration to produce energy which is needed for growth of pea pod.
i) Biotic factors Caterpillar Pea plant aphids
Abiotic factors Water content temperature sunlight Magnesium ions
Q2 Problem statement: What is the effect/action of salivary amylase on rice/carbohydrate/starch? Aim: to study the effect/action of salivary amylase on rice/carbohydrate/starch. Hypothesis: Enzyme amylase in the saliva hydrolyses rice/carbohydrate/starch into simpler molecules/reducing sugar/maltose. Variables: MV: content in the test tubes RV: change in colour in iodine test FV: temperature (37OC), concentration of starch, volume of the test tube content. Materials: 1% starch solution, iodine solution, Benedict’s reagent, saliva, water bath, distilled water Apparatus : thermometer, test tubes, syringe, beakers, white tiles, dropper & stopwatch. Technique used: Test for the presence of starch using iodine test at one minute intervals for 5 minutes; Test for the presence of reducing sugar using Benedict’s test. Procedures: 1. Rinse mouth. Collect 2ml of saliva in a small beaker & mix with 2ml of distilled water. 2. Using a syringe, put 1ml Of 1% starch solution into two test tubes & labelled A & B. In another test tube, put 1ml of saliva solution. 3. Place test tubes A, B & C in water bath at 37oC for 5 minutes. Meanwhile, put droplets of iodine solution on white tile. 4. After 5 minutes, put 1ml of saliva solution into test tube A. Start the stopwatch & immediately take one drop of mixture in test tube A & add onto a drop of iodine solution on the tile. Record the change in colour of iodine solution. 5.Repeat the iodine test at 1 minute interval until the iodine solution does not change in colour (for 5 minutes) 6. Repeat step 4 & step 5 for test tube B & test tube C by adding 1ml of distilled water into the respecting test tubes. 7. When the mixture in the test tubes does not show any colour change in iodine solution, then add
1ml of Benedict’s reagent to each test tube A, B & C. 8. Put the test tube A, B & C in water bath & record the results. Results: Test tubes
Iodine test O 1 minute minute
A (1ml of cooked starch solution +1ml of saliva solution) B (1ml of cooked starch + 1ml of distilled water) C (1ml of saliva solution + 1ml of distilled water) Conclusion: Hypothesis is accepted. Enzyme amylase in the saliva hydrolysed carbohydrate/starch into simpler molecules like reducing sugar.
Suggested answers to 2009 MRSM SPM Biology trial Paper 3 Answers prepared by cikgu Sharon, for comments/suggestions, visit http://www.mybiologypal.blogspot.com